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/*
* SonarQube
* Copyright (C) 2009-2025 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.application;
import com.google.common.annotations.VisibleForTesting;
import java.util.function.BooleanSupplier;
public abstract class AbstractStopRequestWatcher extends Thread implements StopRequestWatcher {
private static final long DEFAULT_WATCHER_DELAY_MS = 500L;
private final BooleanSupplier stopRequestedTest;
private final Runnable stopAction;
private final long delayMs;
protected AbstractStopRequestWatcher(String threadName, BooleanSupplier stopRequestedTest, Runnable stopAction) {
this(threadName, stopRequestedTest, stopAction, DEFAULT_WATCHER_DELAY_MS);
}
@VisibleForTesting
AbstractStopRequestWatcher(String threadName, BooleanSupplier stopRequestedTest, Runnable stopAction, long delayMs) {
super(threadName);
this.stopRequestedTest = stopRequestedTest;
this.stopAction = stopAction;
this.delayMs = delayMs;
// safeguard, do not block the JVM if thread is not interrupted
// (method stopWatching() never called).
setDaemon(true);
}
@Override
public void run() {
try {
while (true) {
if (stopRequestedTest.getAsBoolean()) {
stopAction.run();
return;
}
Thread.sleep(delayMs);
}
} catch (InterruptedException e) {
interrupt();
// stop watching the commands
}
}
@VisibleForTesting
long getDelayMs() {
return delayMs;
}
public void startWatching() {
start();
}
public void stopWatching() {
// does nothing if not started
interrupt();
}
}
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